Flexor Pollicis Brevis Muscle. Anatomical Study and Clinical Implications

Edie Benedito Caetano, Yuri da Cunha Nakamichi, Renato Alves de Andrade, Maico Minoru Sawada, Mauricio Tadeu Nakasone, Luiz Angelo Vieira*, Rodrigo Guerra Sabongi
Department of Orthopedics of the Pontifical Catholic University of São Paulo, Paulo, Brazil

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© 2017 Caetano et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at Pontifical Catholic University of São Paulo Rua Joubert Wey, 290 CEP 18030-070 Sorocaba (SP), Brazil, Tel: (15)-3212-9900; E-mails:;



This paper reports anatomical study of nature, incidence, innervation and clinical implications of Flexor Pollicis Brevis muscle (FPB).

Material and Methods:

The anatomical dissection of 60 limbs from 30 cadavers were performed in the Department of Anatomy of Medical School of Catholic University of São Paulo.


The superficial head of FPB has been innervated by the median nerve in 70% and in 30% it had double innervation. The deep head of FPB were absent in 14%, in 65%, occurred a double innervation. In 17.5% by deep branch of ulnar nerve and in 3.6% by recurrent branch of median nerve.


The pattern of innervation more frequent in relationship to the flexor pollicis brevis muscle and should be considered as a normal pattern is that superficial head receives innervation of branches of median nerve and the deep head receives innervation of ulnar and median nerve.

Keywords: Median nerve, Ulnar nerve, Hand innervation, Cannieu-Riché, Thenar muscles innervation, Anatomical finds.